Method for operating optical sensors

a technology of optical sensors and optical sensors, applied in the direction of instruments, using electrical/magnetic means, geological measurements, etc., can solve the problems of cumbersome, correspondingly expensive, and inability to constant measurement accuracy

a technology of optical sensors and optical sensors, applied in the direction of instruments, using electrical/magnetic means, geological measurements, etc., can solve the problems of cumbersome, correspondingly expensive, and inability to constant measurement accuracy

US7214954B2Active Publication Date: 2007-05-08SICK AG
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  • Method for operating optical sensors

Examples

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Embodiment Construction

[0025]An optoelectronic sensor 10 according to the invention is arranged above a conveyor 12, on which goods such as packages 14 are being transported in any desired direction 16. The packages 14 are automatically measured by the sensor 10 during their transport to determine their volume. The measurement results can be indicated on a display unit 18 and / or they can be fed to a suitable signal output for further processing.

[0026]The optoelectronic sensor 10 can be a laser scanner, such as is marketed by the assignee of this invention, SICK AG of Germany, under the designation LMS 200, which scans the package 14 in familiar manner with a laser beam 24. The volume can ultimately be determined from the angle and distance information of the reflected laser beam.

[0027]When determining the volume of a square-shaped package 14, it is necessary to determine its height h, width and length L. The accuracy of the length measurement in the transport direction 16 is, as mentioned above, dependent...

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Abstract

A method for operating an optical sensor for measuring a physical quantity with a defined scale value that is subject to a calibration certification. The measurement accuracy of the quantity being measured is dependent on at least one external condition, and a given scale value is used for the measurement according to the desired measurement accuracy. The scale value is appropriately changed when the measurement accuracy changes due to a change of external condition. An optoelectronic sensor has a switching arrangement for changing the scale value. The sensor is more diversified and can cover larger measurement ranges without requiring new certifications or authorizations for the different measurement ranges.

Description

BACKGROUND OF THE INVENTION[0001]The invention concerns a method for operating an optical sensor for measuring a physical quantity, as well as the corresponding sensor.[0002]In general, one must define a so-called scale value for measurement devices with which a physical parameter is being measured and which operate pursuant to a calibration certificate. The scale value corresponds to the smallest indicated dimensional unit and is used to define the measurement accuracy. The measurement results may only be indicated in multiples of the scale value. By definition, scale values should only be selected in steps of 1, 2 and 5 times 10n (n is an integer). The definition is mandated by national authorities, for example, in Germany, by the Physikalisch Technische Bundesanstalt, which follow the recommendations of the OIML (International Organization of Legal Metrology).[0003]Each calibrated measurement device has one of these scale values and is suitable for applications with a measurement...

Claims

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Application Information

Patent Timeline
08 May 2007
Publication
US7214954B2
IPC
G01N21/86; G01N21/88; G01V8/00; G01B11/04
CPC
G01B11/04
Inventors
SCHOPP, THOMAS